Huckabee quite possibly will benefit from the ad, but the underlying dynamic is that Huckabee is in many ways Rudy Giuliani's best friend in this race. As Ramesh Ponnuru says:

I have always thought that Giuliani could not win a two-man primary. I no longer believe that. He could beat Huckabee even in a two-man race. He can root for Huckabee to take out all his stronger competitors.

Right. Obviously, best-case for Giuliani would be to win Iowa. But that hasn't looked realistic for a long time. A Huckabee win is probably his next best option.

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